From the April 2012 issue:

The liberal view is that human nature is fundamentally good and should be given room to flourish. The realist - and biblical - view is that human nature is fundamentally evil and must be conscientiously governed. Thankfully, the Framers [of the US Constitution] took the latter view. That is a big part of the reason that the system of government they created, while imperfect, has stood for over two centuries and done much to guarantee the success of the United States of America and its people.

And now you know... the rest of the story.